. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 361 ricial aspect. The latter is easily obtained by a method first employed by Savi; this consists in cutting off the convex trans- verse section of a column with scissors, and then separating out the single thin plates of which it consists, in some indifferent fluid. It is these fine discs, lying one upon the other like the coins in a rouleau, or the plates in a voltaic pile (Fig. 230), which (as du Bois-Eeymond was the first to point out) become electromotive under the influence of the nervous system. " The electromotive comp
. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 361 ricial aspect. The latter is easily obtained by a method first employed by Savi; this consists in cutting off the convex trans- verse section of a column with scissors, and then separating out the single thin plates of which it consists, in some indifferent fluid. It is these fine discs, lying one upon the other like the coins in a rouleau, or the plates in a voltaic pile (Fig. 230), which (as du Bois-Eeymond was the first to point out) become electromotive under the influence of the nervous system. " The electromotive components of the primitive batteries of the fish's columns must not lie sought in optically separable structures, in heterogeneous, contiguous tissues, or in animal fluids. The seat of lies rather in the centre of a morphologically homogeneous tissue, the so - called ' electrical plate' " (du Bois-Eeymond 4 cl, II.). In their normal position in situ the plates are approximately horizontal, curving only in the middle towards the animal. back of the On treatino; them with. FIG. 230.—Schema of a single prism in Torpedo with ingoing nerve (Wagner's < mi-brush). (Fritsch.) reagents, however, various strata appear in the longitudinal sections. Each plate seems to be bent backwards at the margin, where it is attached to the connective- tissue septa, the ventral half being more particularly involved (Fig. 231). The single plates are somewhat further apart in the larger than in the smaller columns. From the ventral aspect, each plate exhibits a rich plexus of nerve-fibres, with a sprinkling of capillaries, embedded in a gelatinous tissue studded with star-cells, which fills the intermediate spaces of the plates, and gives the appearance of a quivering jelly to the fresh sub- stance of the prisms. When we remember the number of nerve- fibres in each single plate, the wealth of nerves in the entire organ is surprising, and witnesses to its intimate relations with. Please not
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